Fuel Economy for TDI brain teaser - Defender Source
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  #1  
Old December 15th, 2007, 10:00 PM
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mark kellgren
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Fuel Economy for TDI brain teaser

My 2.8 has started to decline in it's fuel mileage over the last few months, going from 19.5 mpg 6 month ago, to 16.5 as of the last 2 tanks over the last 30 days. There hasn't been any change in driving style, and I"m wondering what has effected such a drop over time.

facts: I've run 2-3 tanks of biodiesel over last 3 months, but all my lines per Pendy are bio-ready. Temps have dropped from summer heat of 90's to 50-70's around here in last 30 days.

raised intake on entire time. air filters, water seperator and primary fuel filter replaced in last 2 months. it is about time for an oil change.

so what are the factors that can effect a turbo diesels economy, given same driving conditions?
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  #2  
Old December 15th, 2007, 10:43 PM
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Michael Steil
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Tire pressure?
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  #3  
Old December 15th, 2007, 10:46 PM
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David Marchand
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Additives in the bio-diesel to lower the freezing temp. Same is done for regular diesel in the winter.
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Old December 15th, 2007, 11:23 PM
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Winter diesel is known to cause a drop in mileage
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Old December 16th, 2007, 12:25 AM
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Jim Cheney
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One time, I had a remarkable drop in fuel mileage, and after popping the hood, I noticed my fuel returns had come undone and were dropping all the extra fuel on the ground instead of returning it to the tank. There was also an associated mess of course...
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  #6  
Old December 16th, 2007, 10:11 PM
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John B.
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I always see a drop in mileage in the winter in all my diesels. I assume it is due to the change in fuel.
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  #7  
Old December 17th, 2007, 06:21 AM
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Like they said...it's the winter grade fuel. Expect about 10%-12% less mileage.
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Old December 17th, 2007, 11:01 AM
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mark kellgren
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thanks all for your collective response. Anything that can be done to offset it? Do cetain boosters help?
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  #9  
Old December 19th, 2007, 11:24 AM
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George Kase
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Do not underestimate tire pressure as a key factor...makes a diff of up to 4 MPG on my truck...also winter fuel of course...
George
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Old December 19th, 2007, 12:33 PM
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Jim C.
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Checked the Cummins and Defender. I've lost 2-3 mpg on each.
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